TY  - BOOK
AU  - Smith Donald R
TI  - Singular-perturbation theory: an introduction with applications
SN  - 0-521-30042-8
U1  - 515.35 
PY  - 1985///
CY  - Cambridge
PB  - CUP
KW  - Differencial equations-numerical solutions
KW  - Perturbations(Mathematics)
ER  -